To sensationalize a story or an event is to dress it up on purpose so it seems as strange, exciting, or shocking as you can make it. You pick the loud detail. You skip the slow, careful parts. You may not be telling a straight lie, but you are not telling it straight either. People use the verb when they disapprove. In British spelling it is often sensationalise, with an s.

把事情煽情化、寫得／講得特別聳動（帶批評）。英式拼成 sensationalise。